Midterm I Dont Know Flashcards
Dermis
below epidermis
Function: collagen and elastic fibers, keep skin hydrated, holds body together sensory perception
Structure: blood vessels, nerves, glands, hair follicles, dense irregular tissue
Epidermis
uppermost region of skin
Function: protection
Structure: stratified squamous epithelium, keratinocytes, melanocytes, langerhan cells, merkel cells
Hypodermis
below dermis
Function: fat storage, alternative energy source, insulation
Structure: areolar & adipose CT, attach to surrounding organs, large blood vessels to supply skin with blood, nerve ending
Connective Tissue
Connective tissue (CT)
Function: connect tissues, protection
Structure: cells, fibroblasts, osteoblasts, hematopoietic
Fibers:
Collagen- adds strength
Elastic fibers- elastin (stretch and recoil)
Reticular fibers- collagen (provide a framework for soft organs)
Ground substance:
Fills space between cells and fibers
Help in diffusion of nutrients
Loose CT
Not as dense
Areolar CT
Reticular CT
Adipose CT
-Fibroblasts
-Found in kidneys and breasts
Dense fibrous
Structure: can see a lot of fibers, mostly collagen
1. Regular
Collagen fibers are densely packed parallel
Tendons
Ligaments
2. Irregular
Collagen fibers random
Withstand stretching
Found in epidermis
Ligaments
Muscle tissue
Structure: highly cellular, actin/myosin filaments
Function: to contact, movement of body
1.Skeletal
Striated, most abundant, voluntary movement, bones and skin
2.Smooth
Spinal shaped cells, no obvious striations, propel things through intestine, hollow organs & blood vessels
3.Cardiac
Heart, branching & striated, dark bands allow for quick communication
4.Nervous tissue
Transmit electron signals
Neurons & neuroglia
What are the stages of homeostasis
Stimulus- causes change
Sensory receptors- monitor outside environment and react to change
Regulatory center- determine how to maintain and what to do
Effector- causes change and bring body back to normal
Response- change goes back to normal
Skeletal system
Provides support
Gives shape
Nervous
Detect impulses
Control center
Circulatory system
Transports nutrients and gasses
Respiratory
Exchange gasses
Digestive system
Break down and observe food
Muscular system
Provides movement
Integumentary system
Protect body
Regulate temperature
Prevent water loss
